Modify the Footnote Text paragraph style to suit your needs. You can do this
via the Modify Style dialog box: In the Styles pane (Ctrl+Shift+Alt+S),
click the Manage Styles button. Click the Edit tab. Locate Footnote Text,
click Modify and make the desired changes. If you want to transfer the new
settings to the attached template, remember to click "New documents based on
this template" before exiting the dialog box.